GROOMBRIDGERS

Planet of Origin: Third planet orbiting the star Groombrdige 1618

An advanced reclusive species that has transfered its spirit inside a virtual reality program in a vast computer system on its homeworld's underground and which has the power to turn stars into supernova.

They have the plan around the turn of the 2nd millenium to turn the star Betelgeuse prematurely into a supernova  to sterilize a large volume of the galaxy and prevent any upstart alien visitors from discovering and possibly destroying the underground computers that house their cybernetic souls.

Source: Robert J. Sawyer, Calculating God New York: Tor Books, 2000